Devil's Dyke, Hertfordshire

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Devil's Dyke is the remains of a defensive ditch around an ancient settlement of the Catuvellauni tribe. It lies at the east side of the current village of Wheathampstead, Hertfordshire, England.

The area was excavated by Sir Mortimer Wheeler in 1932, and according to a plaque at one entrance to the dyke, presented by Lord Brocket in 1937 on the occasion of the coronation of King George VI.

The site is said to be where Julius Caesar defeated Cassivellaunus in 54 BC. Although the historical evidence neither supports nor disproves this, the sign at the entrance to the Dyke states this (based on the assertions of Sir Mortimer), which has led to the claim often being repeated as an established fact.

It is believed to have been originally settled by Belgae invaders, and nearby archaeological finds of Belgic and pre-Belgic pottery, in excavations during the 1970s, appear to confirm this.

Today two sections of the ditch remain. The western section, adjacent to the village, is named Devil's Dyke. It is around 30m wide and 12m deep, at its largest. A smaller ditch to the east is known as "The Slad". A moat continues the line of the ditch to the south of The Slad.

Some archaeologists believe that the ditch was connected with other local earthworks, particularly The Slad and Beech Bottom Dyke, located a kilometer away to the south east, to create large enclosed settlement, utilising a single defensive earthwork running from the River Lea to the River Ver, which, if correct, would mean that it was the one of the largest Iron Age settlements in Britain.

The site is marked Belgic Oppidum on Ordnance Survey maps.